KSCC kscc25

What is RNRF (react-native-router-flux)?

React Native is great product but lacks for stable, intuitive and easy navigation API during many years. Every year we see new, better API: Native Navigator, ex-Navigator, NavigationExperimental, ex-Navigation, wix native navigation, airbnb native navigation, ReactNavigation...

Once I've started React Native development, in 2015, I created RNRF - simple API for easy navigation. It was clear that better navigation instruments will come later but I didn't want to change my code again and again to switch for better API. Every new major version of RNRF is based on different navigation framework and mostly preserves own API.

Another goal was to represent all navigation flow within one place in clear, human-readable way - similar to iOS Storyboards concept. This way other engineers could understand your app flow faster.

auth with microservices

Authorization and Authentication are hard. when you only have to implement them once (as you do within a monolith) instead of over and over again, it makes the developer happy :-), and maybe leads to less implementation failures.

When you have a bunch of microservices, this is something that has to be considered.

Implement it once or in every microservice, or something in between?

On Tue Oct 27, 2015, history.state.gov began buckling under load, intermittently issuing 500 errors. Nginx's error log was sprinkled with the following errors:

2015/10/27 21:48:36 [crit] 2475#0: accept4() failed (24: Too many open files)

2015/10/27 21:48:36 [alert] 2475#0: *7163915 socket() failed (24: Too many open files) while connecting to upstream...

An article at http://www.cyberciti.biz/faq/linux-unix-nginx-too-many-open-files/ provided directions that mostly worked. Below are the steps we followed. The steps that diverged from the article's directions are marked with an *.

* Instead of using su to run ulimit on the nginx account, use ps aux | grep nginx to locate nginx's process IDs. Then query each process's file handle limits using cat /proc/pid/limits (where pid is the process id retrieved from ps). (Note: sudo may be necessary on your system for the cat command here, depending on your system.)
Added fs.file-max = 70000 to /etc/sysctl.conf

	chamerling@macbook-air-de-christophe:~/src/openpaas/rse-chamerling\|CAL-605-rename-events⚡
	⇒ curl -XDELETE 'http://localhost:9200/users.idx/'
	{"acknowledged":true}% chamerling@macbook-air-de-christophe:~/src/openpaas/rse-chamerling\|CAL-605-rename-events⚡
	⇒ node ./bin/cli.js elasticsearch -t users
	debug: local/SUBSCRIBE to mongodb:connectionAvailable
	[CLI] INFO ElasticSearch has been configured
	chamerling@macbook-air-de-christophe:~/src/openpaas/rse-chamerling\|CAL-605-rename-events⚡
	⇒ node ./bin/cli.js reindex -t users

	#!/bin/bash
	### BEGIN INIT INFO
	# Provides: YOUR_NAME_HERE
	# Required-Start: $local_fs $remote_fs $network $syslog $named
	# Required-Stop: $local_fs $remote_fs $network $syslog $named
	# Default-Start: 2 3 4 5
	# Default-Stop: 0 1 6
	# Short-Description: Start/stop the forever nodejs application
	### END INIT INFO

	#!/bin/bash
	#
	# description: DevShelf service
	# processname: node
	# pidfile: /var/run/devshelf.pid
	# logfile: /var/log/devshelf.log
	#
	# Based on https://gist.github.com/jinze/3748766
	#
	# To use it as service on Ubuntu:

	var express = require('express')
	, http = require('http')
	, connect = require('connect')
	, io = require('socket.io');

	var app = express();
	/* NOTE: We'll need to refer to the sessionStore container later. To
	* accomplish this, we'll create our own and pass it to Express
	* rather than letting it create its own. */
	var sessionStore = new connect.session.MemoryStore();

	#!/usr/bin/env python
	# encoding: utf-8
	"""
	client.py

	Based heavily on:
	- https://github.com/mtah/python-websocket/blob/master/examples/echo.py
	- http://stackoverflow.com/a/7586302/316044

	Created by Drew Harry on 2011-11-28.

	#!/bin/bash

	sudo mount -o remount,size=10G,noatime /tmp
	echo "Done. Please use 'df -h' to make sure folder size is increased."

	#! /usr/bin/env python

	import redis
	import random
	import pylibmc
	import sys

	r = redis.Redis(host = 'localhost', port = 6389)
	mc = pylibmc.Client(['localhost:11222'])